Task force chairwoman Lori Lightfoot called the report a "blueprint for change" and urged city police and officials to forge a better relationship with citizens.

"The pain and the anger and the frustration that people across this city have articulated to us... is something that has to be understood, has to be respected. And it has to be embraced if we are ever to move forward,'' she told a news conference.

The Task Force on Police Accountability described the existing independent review body, which investigates misconduct, as "badly broken" and recommended replacing it with a "new and fully transparent and accountable Civilian Police Investigative Agency".

"There's no doubt we have a lot of work to do," said Mr Emanuel, adding that people had to have confidence in the agency that reviews police behaviour.

He said he was waiting to be briefed by the task force and to see the whole report before giving further details.

Activist Greg Livingston said the report "raises consciousness", adding: "It shines a light into the darkness."